Yes. A Power of Attorney can request an absentee ballot for an elector. No person (not even a POA) may "vote" a ballot for another elector. If the elector requires assistance in completing the ballot, the elector may designate another person to assist the elector in marking the ballot.* In the presence of the elector, the ballot is marked according to the elector's direction. The assisting elector must sign their name on the ballot under the section entitled "Signature of Assisting Individual."
*The assisting elector cannot be the elector's employer or an agent of that employer or an officer or agent of a labor organization which represents the elector. S. 6.82(2)(a), Wis. Stats. 3/12/2003